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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7554cb6dea6ae9d8401cf66ef76deb29af911d9f9c6a9c9b42421f3366e623' 
  AND token = 'Yb/dLf18lwsfYm4pyc4crnmLuaHIBQKhKUDOfkiC5k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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