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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c59f77466e3538014c50c6de69d38a20cc22346dcab781e4256ffc30e1e788' 
  AND token = 'cxeO0QzHJTHJmnhcs2hiJzo3OvcFB+p/x7JE3hcm2W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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