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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b09e3201cd704866218ff875109bf1c83ba2b439faad8bfef5ef4b4464de89' 
  AND token = 'vTQa8lG1QMQzadmAZd4cXHfPD8p5ildturqDfX4XIJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}