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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f7e0482761cd266354470b6062a60db1dc560aca1dd30cae0952355a77da84' 
  AND token = 'iLBp02liQxD7//aia9/LmJalCOpqqlzRfbc8FICEWg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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