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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '291b5d0b4e8d4f6a19c2113aaf7e28c111706d1ec8e90c7d828a035564127a09' 
  AND token = 'hj2JXARetjoymLTHsrq1L/FmN43WVs9/IPws7Y6kocE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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