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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3faa567f5f2a6a3d479c6d2025f95db93d4a48d9469087c0ee30ec4321e296' 
  AND token = 'v66hcBnaKNTMMbDG8UnTW06gZ2TESXN/RncYehCqFnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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