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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6668388d33d66abfd3f3755086790fad961b7503dd6769930b488ab35c3b2e37' 
  AND token = 'JF9oDgij3YEVQclUiHKsIH6WpvvU4N7QpL9+VUM3VPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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