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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36614b42bde7d423895a5b7ee7f43de765dcf99cca40d0a88685ce3a5e288e87' 
  AND token = '7mrEcuUxxhq6/UxSm7gJKTFijq+yd0gP/Vi0PynK9rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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