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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7a7f0c55df0514665db3800e44f378ec6573e25d06df2ffe2fe6004d2168a5' 
  AND token = 'Fnjp6h1TQilxXzeN3W86Oyn5ywxxppZ9EFDgVRt0KXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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