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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c581ed6376e616dcf58a24e9643fa57ac02d8716636c5499ba4966033a1f20' 
  AND token = 'g3LNAZN4bp2Scgps2AMoYUhl914D8DHmYciuWGULyvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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