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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd60f7cf573f3e42ff70fa997b5798e58767692b902ab77677d0a3e87675171f7' 
  AND token = 'Vn7JZZGPhWSYUR4ImHBiY22AyvDNBp6sdOjV3DeKy1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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