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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6135fada8ed8e62b49f26905e9d9f860e01ce642c23a79c6c65ce582ecb4476' 
  AND token = 'tIu4uDqYeC9jNWJPW1pXOrqzWSt411cVgwlVtZwRU3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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