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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3aef13f2af41bb830cd6750495376a7371d90a3624e01fe38a70135ef632d3' 
  AND token = 'q9Yi2M7G64h4+wilHwwVuxLd42HcOEpdSvFx4HStWWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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