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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b5e8001882923eaf18d91d4d92d2188e666cd8d8eb4a2311764f1852dd76143' 
  AND token = '0PE8ZrAb/l83Kl9Y8ObHN6Ksq9TNdhpscio+lVP/68w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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