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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999216175ed7bfa487b962e7ad93da788969cca3e07b6201994c5a0ea94dc663' 
  AND token = 'QYKj6h6+3T19RC71waHGLNPcdFBnD7edd5Wp9wHBdlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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