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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e859554de7929e8ad1d7b021fc7ead188e2bb1ddde1cfaeef5146b5caafef9d7' 
  AND token = 'CxrG0GrjK485aiNHtLllGI2nGchMAyMNVcTw+8TtSJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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