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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c97ac15a6cae1eedfd60fd262243cfcfdf8693a85392d9d2c95f4c0bc10c7ff' 
  AND token = '7FUqsgfmo4Q38dlsFDIXFAYuEYGTBhgBDtMnszwYZeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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