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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bace26236b9124b203f61f4ce37e8f3a0c0722a218abb2d0a684d1cda8ca057d' 
  AND token = '8HGaPbKDhapsUqwirxCKspWjR7ceMAKlB5QaUW0Q/e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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