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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20cdb3fadfb51a68fa52896b816d9267fd187cdd3fe60799796ce9eb0f8a73d' 
  AND token = '3XIw6obzL9BS6Rc8TM8rNXrf+qx94VANBwKuVdNmlyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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