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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944c0d11e9297860586f029ddb362acc09a0b5b363ab38c1d34028a495cdef5e' 
  AND token = 'k5CbwGHZCYTfQD/Q6It5WR8fEwjXwGwqcA/FrDun1yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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