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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e9808adc4c8f6d4edf37902fe610209647625f9c8afacebdb75ab0260ca1f6' 
  AND token = 'k9lZ/zadM4yg0tiX3QP1VkymxCja1Bmj+jiggu79teQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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