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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec3d48dbea4c0e89d422e7efb4a8c1899ae89b8529e7211322c5c4684f22a865' 
  AND token = '0h18Mwfgld5G9ukhSv/F+hHPeYw53dwBXP8LWj6YzGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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