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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb820d12000c3a6f9d3f1459869f5404c790941da5a20c2abefe70f057ad673f' 
  AND token = 'giLei0UoSMtR65ykttGWFV/FEXyzalqokTqzaJASBps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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