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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f172955afb0db6dc0ee1a02b87d4a185262025c4e2a8493622f3cf26d99988f0' 
  AND token = 'BUyjGaTuEc7oZOIW7FZpuZSG3zhLxUN28CTaGyoD2Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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