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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f0850359dc1616caf75ca351e0c4b66cffaecb55ecc4d05a514fd78c50265f' 
  AND token = 'QnY/cT07sw/ACAg0dfTVLh3X24vaL0JcHiA//NAzpak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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