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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1ac962a3565a0e37693f706778ca378fe0ac40d08f7f47acce4111f4e72a84' 
  AND token = 'R41d4+Ls1IdJQX6RREsV4CrPCyoskWfQYFBE5b6DSlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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