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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631e9605a940bb9dc4c93aa6056c057fb2dd42bb5dcf0edc22b075dc57500041' 
  AND token = 'ItC7Wq0SOfLhYMZy0PbTlbscZo9unmSqf8/ZRng8ERI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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