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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16e069b730b5cdab2ad9874a1ed0e355ff4bbc1b9bb5c7ce7c6df134387cc44' 
  AND token = 'XcTmyAyqDHvOCav/IdEBLyNqHl09oXXqqdWwIXLTl5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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