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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0989aec6edc45ccd8090c8783fae6c9ff1be6f9024b11d0b161f7795ac01c760' 
  AND token = 'c2U5wowPxLCvkJb5k3auEkUoq1ga5y8eZqrfw2Yqq3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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