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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89a78dec671af403e5b87fd0831b29aa69db0bdc8ccb3e5310264ccc3e4e127' 
  AND token = 'q6xHGqe2vrtIvIHjSACFX5gx1UvpA48d7tnFuSUUye0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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