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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd907a7bf392cb957f11c237f3eff364ed6b155e5696e7e1731bc99d828344b' 
  AND token = 'FEbaYlAYkI39Q/oiiw1AqBgQN5dTtm2oYPyhs9T7r/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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