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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8acab5bcbfc96cd853329143ee58d8cbf2c64fbfddda8c891944801bdd777356' 
  AND token = 'r6S+yc+jexQ21CJjVDlora+5r6EwNO5bI00MzjIdJBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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