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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17940d2ef4df60e5b8d12f7c2336d7f45133dbf18b0c3a808d3bd79fc74b6ea6' 
  AND token = '1C0JgJH57Wez9M317BRod3C1POx+HrP8gmMTZs78mh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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