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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5be27fda8e45f5ee3a0ce279d19d664b4c5f41c825be6478de7b39a9643b0ff' 
  AND token = '7ATHvvslkBhmo7r7KTIv9++ALGLfrO6zgQ21010mUO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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