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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca04010d0e7103968843023a0a0003fcf833390c75790b89f9779175c9af8da4' 
  AND token = 'E5CqELGj20qTkOE/i5xGHP5ir8etBKSvPdaXjjWX8rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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