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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8673c615a963e005b2e3c603a5a6ab939161f3cf0079f04f86fb693dcebd1e' 
  AND token = 't68IQbRAVF08bgQ+wT+//cDZGoDS7KCum7yEXXGcaHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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