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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62059d9545378383a9fa6630d0ae13e78a0950a93ba0e5a7ac0f73afb4921df5' 
  AND token = 'kYHCIK17wLrboiv8ENjucO5V7t5f4+HXHj+nLRv09YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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