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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1674d1853d5001775104eddf13b5edb3c010248a7ac61fde12d7f8e666f41f1b' 
  AND token = 'Khau03Xr3nAke3j49toOwMEoj6tYQgcnBlTiK/cc0Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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