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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea24c65471ed75b410ec6c8075c64685ead25ba0aa831f0dec29e46ef329886' 
  AND token = 'MZ7aBHpMIDAP3OAVp0OOGAupENbjLatEPwJ1nWWK7HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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