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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3712082db85df23b144cc3f6f2c9a7f5d9afa6243569332b97c03e3da35b9768' 
  AND token = 'a6oxpZX4xlg1JkyWjac81Mxeb0R2AsdFb2bzFhNruC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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