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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5f7d10bbd49b6e35791b7f3b7f39740b0ac383265971f14aae28bc946e7ae3' 
  AND token = 'b0CcjVOxYqNrnDbPZG1I8Iiq8itHeqtaIWokiFIheXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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