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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffc43866a6348536ea0fbfd55a4f75cacf3aaa05590e61b87fffd6ae465753f' 
  AND token = 'aDkkkJLvYn4kbreWg4b5I9PI+euz+74ppl0/NirJIKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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