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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538bf2f261c6064de3b27dbbab4eed81885a6977da982f60ed1ef1777677e8a0' 
  AND token = '8Tya2RKaZIpgl5svL5FiLihNcWvTx6eDFchhNI6CYzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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