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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a171eaa970280258221a1563af17bb96a02e57b6989d71fb18a18ae61b4f943' 
  AND token = 'psKU5Bv21QeWxgdkpqXHx6by+E4FHv8wLGABldRzyOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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