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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fce89077aef606489c9f4f266ad85010da44ca2d50d4cc73d0968a568d1c3ab' 
  AND token = 'rUfWsgqsjI90fXhhDnNlmeJlv+kNWOu9gPmg/1L5UQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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