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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6cd3165ae8c13c8475ae921e0319bfaeb4ced92f04ce2cebb10dd257b36935e' 
  AND token = '+AEGzn40r2kutZWNMr2QSo7v8gcYWqs2d4kDY7f7BSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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