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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74dcfef1dcb32ed2a1d3c99487fa2ff352179f3dd79b8d1d7b1463dec3284d9f' 
  AND token = 'PRB7Kd7zxeQ7XP+ZTqxZ9WQQvqJEkC29hx6nvLDtBA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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