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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206768c9579507e8634506816edacb25d5f172f303a25dab2564da3be4b8090d' 
  AND token = 'gMj9/ln06DcmznJ1pIO/pc9Acqh4Ir81BiEajdPAaxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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