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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28fc0f10971a7cb39ccb84c658d58c71a0e662e8d4b0b11233099ffb921307c5' 
  AND token = 'xuaHhF/f3RMrznwQeXrEtcyuAuP2vRdl3bbQeADIlyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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