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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470580e102ec89800e8be4c3420b4d8a10522213f5ef3bc438e8ff137f889317' 
  AND token = 'KAP8eF8bvu61wbHgPj2xNrCB7DshgoS+DDj6vrInm4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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