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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02da99e8971a5751d5ef5ded1be8b6b3832d9bea72736af39d8a44496856fe7b' 
  AND token = 'bd0B0P/rofcwMNx+4RrphVfUypMY7/kWH1X+fFuTy9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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