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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd471260e42ed74f968d71ce842fe6840eabb4f4f346894b9e4c1cc039c785c07' 
  AND token = 'A43VHrZ1jCaifaLVS+T5ZCofA1hhsrIMviJfxe4hN6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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