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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6457c16a34e8e1c1bbd17ea79778d99da44d0c4e5fedf3eb7d972fcc103b3ef4' 
  AND token = '1a8HA50ejAMBFEgcWeidGYRkzBA9L2cdSi5i92CglIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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