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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5d35846ef8fe353e2346a17a7119fbcdaf2390d61152683dd786286463ec5b' 
  AND token = 'OMNpd1sXuzhP2G+WNT6n98CHAUvDD8UMsDYAm0y+5RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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