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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f17850cbdd02e79e4a11b712c3b7818d7fc7f59132241bd4c83f55a4473f72' 
  AND token = 'psx/jHy4wzIBYc76vRWbRV/MhnDEMNE5a723oSn4Ua8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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