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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e718496435b0fca39516330c8aa26eccac9c83d96702160f44aefff38943b522' 
  AND token = 'Uf3TnowG6paun4qgBLx+hejwP9bKp5yRB9rTB+jcRio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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