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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86a56bd060b8c09e707ae009dea5d195281707b54edaa1cb6dfa3a684b2d188' 
  AND token = 'JLCKiQD0zuz6drBrEf7RzZDn32vAZcA0i5ruwG5GwNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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